SRC/csyconv.f(3)

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version 3.12.1 · 4 versions
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🎀 SRC/csyconv.f(3) — Library Functions Manual 🎀

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🌸 NAME 🌸

SRC/csyconv.f

✨ SYNOPSIS ✨

Here's the callable vibe, fr fr:

Functions/Subroutines
    subroutine csyconv (uplo, way, n, a, lda, ipiv, e, info)
        CSYCONV

💖 Function/Subroutine Documentation 💖

Meet the main character:

subroutine csyconv (character uplo, character way, integer n, complex, dimension( lda, * ) a, integer lda, integer, dimension( * ) ipiv, complex, dimension( * ) e, integer info)
CSYCONV

🦋 Purpose 🦋

CSYCONV converts A given by TRF into L and D, and vice-versa. It gets the non-diag elements of D — they're returned in workspace — and it applies or reverses the permutation done in TRF. That's the whole assignment, bestie. 💅

🎀 Parameters 🎀

🌟 UPLO

UPLO is CHARACTER*1. It specifies whether the details of the factorization are stored as an upper or lower triangular matrix. The options are:

  • = 'U': upper triangular, form is A = U*D*U**T;
  • = 'L': lower triangular, form is A = L*D*L**T.

🌟 WAY

WAY is CHARACTER*1.

  • = 'C': Convert
  • = 'R': Revert

🌟 N

N is INTEGER. It's the order of the matrix A. N >= 0.

🌟 A

A is COMPLEX array, dimension (LDA,N). It holds the block diagonal matrix D and the multipliers used to obtain the factor U or L as computed by CSYTRF.

🌟 LDA

LDA is INTEGER. It's the leading dimension of the array A. LDA >= max(1,N).

🌟 IPIV

IPIV is INTEGER array, dimension (N). It has the details of the interchanges and the block structure of D as determined by CSYTRF.

🌟 E

E is COMPLEX array, dimension (N). E stores the supdiagonal/subdiagonal of the symmetric 1-by-1 or 2-by-2 block diagonal matrix D in LDLT.

🌟 INFO

INFO is INTEGER.

  • = 0: successful exit
  • < 0: if INFO = -i, the i-th argument had an illegal value

👑 Author 👑

  • Univ. of Tennessee
  • Univ. of California Berkeley
  • Univ. of Colorado Denver
  • NAG Ltd.

Definition at line 113 of file csyconv.f.

🧚 Author 🧚

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Signed off by LAPACK — Version 3.12.0, page SRC/csyconv.f(3). 🩷✨ That's the footer, bestie. 💅

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